The fact is they do make some of the best sound cards in the world. It is just a shame Linux support seems to be so far down the list of priorities. This is why they should release the hardware specs. There are thousands of Linux users out there who want to use their X-Fi and it would only take just a few of the clever ones to create a decent, working driver.
wrong forum
I use the Intel sound instead, its pretty good! Intel has optical out too on my mobo.
